高精度BDS空间信号完好性评估方法

Assessment method of high-precision BDS signal-in-space integrity

针对北斗卫星导航系统精密单点定位空间信号完好性评估方法研究中存在的问题,构建了一种高精度BDS空间信号完好性性能评估方法。通过轨道时钟误差恢复、空间信号异常排除以及建立误差包络模型,分析了无故障情况下的BDS-2和BDS-3高精度空间信号测距误差的完好性。为准确地剔除有故障的空间信号,提出了一种故障趋势与阈值组合判断的异常空间信号剔除方法,能比经验阈值法更准确剔除空间信号异常,提升了空间信号完好性性能评估精度。通过对2021年1月至2022年1月期间法国空间研究中心的实际数据进行分析,给出了高精度用户测距精度的评估结果,并分析了其值在轨道间显著差异性和星间差异性。

To address the problem of whether the current BDS satellite navigation system high-precision spatial signal ranging accuracy can meet user’s requirements,A method was constructed to evaluate the signal-in-space integrity performance of high-precision BDS by means of orbital and clock recovery,signal in space anomaly rejection and error envelope modeling.An abnormal signal in space rejection method with combined fault trend and threshold judgment was proposed,which could accurately reject the start and end moments of signal in space abnormalities and improve the accuracy of signal in space integrity performance assessment compared with the empirical threshold method.By processing the actual data of CNES from January 2021 to January 2022,the evaluation results of the high-precision user ranging accuracy were given,and the values were analyzed for significant inter-orbit variability and weak inter-satellite variability.